Methylome and transcriptome analysis of flowering branches building of Citrus plants induced by drought stress

文献类型： 外文期刊

第一作者： Huang, Bei

作者： Huang, Bei;Wang, Peng;Jin, Longfei;Wen, Mingxia;Wu, Shaohui;Liu, Feng;Xu, Jianguo;Yv, Xiaofeng;Xu, Jianguo

作者机构：

关键词： Citrus; Drought; Flowering bud and branches; DNA methylation; Transcription

期刊名称：GENE （ 影响因子：3.5； 五年影响因子：3.3 ）

ISSN： 0378-1119

年卷期： 2023 年 880 卷

页码：

收录情况： SCI

摘要： Citrus plants exhibit positive floral response under water stress conditions, however, the mechanistic under-standing of floral induction remains largely unexplored in water deficit. In this study, DNA methylomic and transcriptomic analyses were integrated to explore the flowering bud formation as well as branches building after light drought stress. While comparing with the conventional watering group (CK), the light drought group treated with five months (LD) showed a significant increase in the flowering branches, whereas an apparent decrease in vegetative branches. Global DNA methylation analysis showed that the LD Group acquired DNA methylation in more than 70,090 genomic regions and lost DNA methylation in about 18,421 genomic regions compared with normal watering group, this indicates that water deficiency leads to a global increase in the expression of DNA methylation in citrus. In the same time, we verified that the increase of DNA methylation level in LD group was correlated with the decrease of DNA demethylase related gene expression.Interestingly, in transcription analysis, it was found that the promoting flower genes of the LD group did not increase but decreased similarly with repressing genes, which is contrary to the intended result. Thus, we thought the lower expression of suppressors FLC and BFT were the key influencing factor to stimulate the flowering branches formation after LD treatment. Moreover, there was a strong negative correlation between the genes expression level and methylation level of the flowering induction/flower development genes. In general, we thought high global DNA methylation level induced by water deficit regulate the flowering branches building by reducing FLC and BFT genes expression.

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